Andrew Stribblehill wrote:
The sole maintainer collaborated with another author in writing the program, and they have joint copyright. He would like to get it relicenced under a standard licence but the other author has now died. Is there any way to get it changed?
Yes. If its a joint work, either author can grant a non-exclusive licence, without the other's permission. So the living author can do that without asking the estate/heirs of the dead author.